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All Journal Jurnal Sains Matematika dan Statistika AKSIOMA JURNAL EKSAKTA PENDIDIKAN (JEP) AXIOM : Jurnal Pendidikan dan Matematika Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Jurnal Kajian Matematika dan Aplikasinya Journal of Mathematics UNP Rangkiang Mathematics Journal Jurnal Edukasi dan Penelitian Matematika

Defri Ahmad

Universitas Negeri Padang

Author-ID : 2591774

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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The Effect of Dividend Policy on Stock Prices of LQ-45 Company in the Indonesia Stock Exchange Wella Kurnia; Muhammad Subhan; Defri Ahmad
Rangkiang Mathematics Journal Vol. 1 No. 2 (2022): Rangkiang Mathematics Journal
Publisher : Department of Mathematics, Universitas Negeri Padang (UNP)

An investment choice is a dividend policy. Either the company's gains will be given to shareholders as dividends, or they will be maintained as earnings to finance future investments. The dividend payout ratio and dividend yield are the dividend policy indicators utilised in this study. This study seeks to examine the impact of dividend payout ratio (DPR) and dividend yield on the stock prices of LQ-45 businesses listed on the Indonesia Stock Exchange. Multiple linear regression analysis is employed. The results indicated that the dividend payout ratio and dividend yield had no effect on the stock prices of the LQ-45 companies listed on the Indonesia Stock Exchange. According to multiple linear regression analysis results, obtained sig value (0.606) > α (0.05).

Strategi Kompetisi Antara Tokopedia Dan Shopee Menggunakan Teori Permainan Defrisa Yoga Putra; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

TEMASEK is a company from Singapore. Based on research initiated by TEMASEKand Google in 2015,internet users in Indonesia reached 92 million. 18 million of them are e-commerce connoisseurs and it is predicted that by 2025 there will be 119 million onIineshoppers in Indonesia. This increase will push the e-commerce market value to reach 81billionin 2025. This has resulted in many e-commerce popping up in Indonesia, the top two being Tokopedia and Shopee. Therefore, managers are required to determine what strategies will hook consumers. Game theory is used to find the optimaIstrategy for each pIayer.The purpose of study is to find the optimaIvaIue of the game.This study uses 5 marketing strategies, namely promotion/advertising, completeness, service, payment, and price. The population in this study is Mathematics Students from January to June 2021, the sample of this research is Mathematics students at Padang State University who have used Tokopedia and Shopee.There are two methods of solving, namely using a pure strategy or a mixed strategy.In this case, the settlement uses a pure strategy and theoptimaI vaIue of the game is 0,04 where Tokopedia comes out as the winner with a maximum profit that will be obtained which is 4% if using a price strategy, while Shopee will minimize losses with its strategy, namely a more diverse payment strategy

Metode Lowest Supply Lowest Cost (LSLC) Pada Masalah Transportasi Tidak Seimbang (Studi Kasus Pada Ditribusi Air Minum PT. Anugerah Berkah Bersaudara) Amellia Fadjri; Defri Ahmad
Journal of Mathematics UNP Vol 7, No 2 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Distribution of goods is very important for the company. In order to get a bigger profit, the company tries to deliver the goods in the most effective way possible. There are several warehouse locations and several destinations, with different shipping costs, so the distribution problem can be solved using transportation methods. There are many methods that can be used to determine the optimal solution to the transportation problem. In this study, the Lowest Supply Lowest Cost (LSLC) method was used to determine the initial solution and the Stepping Stone method was used to determine the optimal solution for the distribution of Bottled Drinking Water at PT. Anugerah Berkah Brothers, with the aim of minimizing transportation costs. Distribution problems at PT. Anugerah Berkah Brothers is an unbalanced transportation problem, because the amount of inventory is greater than the amount of demand. Based on the results of the discussion obtained that PT. Anugerah Berkah brothers can save transportation costs from before as much as 8% of the initial cost.

Penerapan Metode Total Opportunity Cost Matrix-Sum Approach (TOCM-SUM APPROACH) dalam Mengoptimalkan Biaya Transportasi (Studi Kasus: PT. Ciomas Adisatwa Padang) Melisa Melisa; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 4 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Product distribution issues are common to happen in a business company. From many factors in a company to maximize profits, one of them is the ability to deliver products on time at the minimum cost in transportation. PT. Ciomas Adisatwa Padang distributes their products in the area of the depot and spends a lot of money. If the transportation costs are too much the company will earn small profits. Transportation method to solve problems that involve minimizing transportation costs or product delivery from source to destination is Total Opportunity Cost Matrix-Sum as initial feasible solution and Stepping Stone as an optimization test that is useful for determining the results of optimizing transportation costs and the number of product shipments from each warehouse to destination. The result is carried out using secondary data recorded from the PT. Ciomas Adisatwa Padang in July 2021 in applied research. The initial method of Total Opportunity Cost Matrix-Sum Approach gave Rp. 8.677.366, which was then followed by the Stepping Stone method, which gave Rp. 8.030 974. As a result, the company can save 21% of the total cost on transportation costs in advance.

ANALISIS MATERIAL REQUIREMENT PLANNING DENGAN METODE ECONOMIC ORDER QUANTITY DAN PERIOD ORDER QUANTITY (Studi Kasus : Coffee Shop Bacarito Kopi Padang ) Abdillah Janaki Daosti; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Inventory control and planning is one of the important things to carry out production activities. To get optimal inventory control, it can be done by using lot sizing technique with Eqonomic Order Quantity and Period Order Quantity methods. The purpose of this article is to minimize inventory costs by comparing the Eqonomic Order Quantity and Period Order Quantity-based lot sizing methods based on Material Requirement Planning to obtain minimal inventory costs at the Bacarito Kopi Padang coffee shop. The Bacarito Kopi Padang coffee shop is one of the SME coffee shops that still controls inventory using conventional methods that have not yielded maximum results. This research is an applied research and the data used are data on ordering costs, storage costs, large requests and the company's Total Inventory Cost. The total value of Total Inventory Cost (TIC) which is the minimum optimal is 23,3% for coffee type raw material, 13,5% for full cream milk raw material, 31,5% for syrup type raw material and 49.1% for raw material type sweetened condensed milk by 26,2%.

Penerapan Metode ASM yang diperbaiki untuk Optimasi Biaya Distribusi pada Masalah Transportasi Tak Seimbang (Studi Kasus : PT. Pupuk Iskandar Muda) Tesa Nofri Handayani; Defri Ahmad
Journal of Mathematics UNP Vol 8, No 1 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i1.12694

Transportation problems is a problem of distributing goods from several sources (supply) to several destinations (demand) with the aim of minimizing distributing costs. The purpose of this study was to determine the optimum cost and optimum allocation in the distribution of subsidized fertilizers at PT. Pupuk Iskandar Muda West Sumatra. This type of research is a type of applied research. The method used in this research is the Revised Version of ASM method which is one of the transportation methods to solve the unbalanced transportation problem with fewer iterations. Base on the result of this study, using the Revised Version of ASM Method, obtained optimum allocation and transportation costs of IDR 711.072.000. Previously, PT. Pupuk Iskandar Muda spent transportation costs of IDR 913.007.000, so the company experienced a 22.12% reduction in costs.

Optimasi Rata - Rata Produksi Ubi Kayu dan Kedelai di Kabupaten Pasaman Barat Menggunakan Pemrograman Kuadratik Metode Wolfe Nurul Hikmah; Defri Ahmad
Journal of Mathematics UNP Vol 7, No 1 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

This research aims to form a mathematical model in the problem of optimizing the average yield of cassava and soybean yields in West Pasaman Regency based on data from the West Pasaman Statistics Agency from 2007 to 2017 regarding the harvest area and average production of cassava and soybeans. The solution to the average production optimization problem uses the Wolfe's Method of Quadratic Programming. Wolfe method is used using a two-stage simplex iteration. The mathematical model formed is a non-linear equation. The estimation of parameters in the mathematical model uses the least squares method, which is calculated using the Matlab software. Optimization results using the Wolfe Method Quadratic Programming obtained an average of 340.95 kw / ha of cassava and soybeans, with an optimal harvest area of 255.38 ha of cassava and 469.5 ha of soybean harvest area.

Model Matematika Dinamika Penyakit Pneumonia dengan Carriers windi jelita; Defri Ahmad
Journal of Mathematics UNP Vol 7, No 1 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Pneumonia disease is an infIammatory disease of the lungs (alveoli) caused by the bacterium Streptococcus pneumonia. When the body's immune system decreases, Streptococcus pneumonia will multiply and cause damage. Individuals colonized with Streptococcus pneumonia act as reservoirs for disease transmission. In Indonesia this disease is an endemic disease. In this study, a mathematical model is presented to describe the population of pneumonia in infants and toddlers. The purpose of this study was to determine the form of a mathematical model on the spread of disease, to know the results of the analysis and interpretation of the results of the analysis of the mathematical model of the spread of pneumonia with carriers. This research begins by determining the variables, parameters and assumptions related to the problem. The model that has been formed will then be analyzed. From the analysis obtained two fixed points, namely disease-free and endemic. From the results of the analysis, it was also obtained that the rate of individual contact could increase the spread of the spread of infected and infected individuals who were resistant to the body while being able to carry the spread of pneumonia

Rekomendasi Pemilihan Smartphone Menggunakan Metode TOPSIS Deva Eliza; Defri Ahmad
Journal of Mathematics UNP Vol 7, No 1 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Smartphone is one of electronic devices in the form of communication tool which in this time the development following market demand. There are many kind of smartphone in the market with various criteria such as price, storage, ram, front camera, main camera and processor. This matter cause many consumers confuse to choose smartphone they will buy, it because there are various type, specification, and price offered when someone make decisions to purchase smartphone. Many consumers always mistakenly choose smartphone according to their need can't be denied. So that smartphone recommendation election be required. The purpose of this research are to know which criteria would be priority of the best smartphone election and to know recommendation in smartphone election based on alternative and criteria selected. The method which can be used to solve smarphone selection problem is Technic for Order Preference by Similarity to Ideal Solution (TOPSIS). The best smartphone recommendation based on budget range is Oppo A52, midranger is Vivo V20 2021, flagship is Asus Zenfone 6 ZS630KL, premium is Xiaomi Mix Alpha.

Optimasi Penjadwalan Produksi Sanjai Rina Menggunakan Algoritma Campbell Dudek Smith annisa yovinda; Defri Ahmad
Journal of Mathematics UNP Vol 7, No 1 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — Kerupuk sanjai Rina business always run into lateness in product delivery because they haven’t done production which will be deliver and delivery deadline only based on intuition. Sanjai Rina have need to establist a better production schedule so that be able to minimizing all product work time total. There are many ways to minimizing total of work time, one of them is using Campbell Dudek Smith (CDS) algorithm. The purpose of the research to know best outcome sanjai Rina production prosess scheduling using CDS algorithm. CDS algorithm obtain k iteration with different values. From k iteration, minimal value will be use to determine production thread. Sanjai Rina business have total time work all of product is 435,88 hours by sequence 1-2-3-4-5-6-7-8. From CDS algorithm iterations, obtain minimal scheduling by sequence 4-8-3-1-2-6-7-5 with total work time all of yhe product is 375,26 hours that will attain saving 60,22 hours time work.

Co-Authors Abdillah Janaki Daosti Ade Fauzan Akira Mikail Alya Anzira Amellia Fadjri annisa yovinda Aulia Fitri Fireza Defrisa Yoga Putra Deva Eliza Dina Agustina Dina Fitria Fadhilah Fitri Fridgo Tasman Ghaitsa Deiwa Karufa HAFIIZH, MOCHAMMAD Hafis Alrizal Indiko Prima Jazwinarti Jazwinarti Kefiano Fangelis Laksono Trisnantoro Media Rosha Melisa Melisa Mella Susriyanti Meria Ultra Gusteti Muhammad Fadhli Gusvino Muhammad Subhan Neneng Gusnela Noni Aryanti Nurul Hikmah Rahmawati Rara Sandhy Winanda Rara Sandy Winanda Rara Shandy Winanda Rida arifi Ronal Rifandi Saddam Al Aziz Suherman Suherman Suherman Suherman Syafriandi Syafriandi Tesa Nofri Handayani Ultari Femi Arshinta Vezalin, Stefanny Vita Kusumasari Wella Kurnia windi jelita Windy Septia Putri Yani Sriyanti Yani Sriyanti

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